01229 718098
07818 603245

Specialist Suppliers of Split Charging Products & Leisure Battery charging Systems for business & leisure

Please note we now have a new website so please click on this link

Please see below a basic guide to all of our split charge systems with help and advise to hopefully help you choose the right kit, first time.

The reason to install a split charge system

The main reason to install a split charge Relay kit in your vehicle, is to charge a second or leisure battery while you are driving. This means you will have enough power or charge in your second battery to use it when you are stopped, camped or working, to use whenever you need it. It will isolate the second battery from the main or starter battery of your vehicle when you are stopped. This will then ensure the main battery doesnít get drained of power when you are stopped, so you will always have enough power in your main battery to start your vehicle. So basicly whenever the vehicle is started the relay will allow power from your vehicles charging circuit usually known as the alternator or generator to charge the second battery or batteries.

A split charge relay explained

A Split charge relay is simply just a heavy duty switch which is controlled by either the vehicles ignition system, a simple on off switch or the more popular voltage sensitive relays which are the Simplest to install and are ativated by a small electric circuit in the relay which detects the rise in voltage when the vehicle is started. It doesnít matter which type you use as they all do the same job. When they are switched on they allow power to pass through the relay to charge the second or leisure battery and when they are switched off they isolate the main battery from the second battery so will always ensure you have enough power to start the vehicle.

Split Charging Cable advise

We offer a large range of cable sizes in our kits to suit most needs and budgets and rate them as Light Duty, Medium Duty and heavy duty. The cables are a very important part of any split charge system and we would always recommend using the highest spec cable you can as they will be allowing the power through the system via which ever type of relay is used for charging the leisure battery.
The size of cable chosen will depend on the sizes of the leisure batteries used as the higher the capacity of battery or batteries the higher the transfer rate of current will be when you start the vehicle and both starter and leisure battery balance their capacity plus also if you will be intending on using a amp, winch or inverter with the engine running as the current from these devices can also be pulled through the split charge system.

Light duty kits are all supplied with 6mm 42amp rated cable recommended for charging up to 110ah leisure batteries on a budget for light duty split charging for general camping and leisure use.

Medium duty kits are all supplied with 10mm 70amp rated cables recommended for charging up to 125ah leisure batteries for a more professional charging system for general camping and leisure use or for use with light duty business vehicles running light duty equipment.

Heavy duty kits are all supplied wit 16mm 110amp rated cable recommended for charging up to 225ah batteries and is our recommended cable size for anyone wanting a top qualty professional heavy duty split charge system suitable most leisure and business uses including powering amps and inverters up to 1000 watts with the engine running.

We also have a range of Industrial duty kits with 25mm 170amp rated cable and 35mm 300amp rated cable suitable for charging large banks of leisure batteries or for running high powered winches or inverters with the engine running.

Battery to battery chargers

B2B Wiring Diagram

A battery to battery charger or B2B is an alternative to standard split charging converting energy from the main starter battery to a three or four stage battery charger offering the best charging system that you can achieve by charging your leisure battery up to 10 times faster than a split charge system will achieve and to a much higher level. We offer a range of Sterling Power and Ring Automtive chargers up to 60amps and recommend these units for anyone wanting the best charging solution for their vehicles and essential for business vehicles needing a good charge in the leisure battery bank or for all the latest Euro 5 and 6 engines with smart charging systems. The battery to battery charger is also the simplest solution for charging a 12v battery from a 24v vehicle or for charging a 24v battey bank from a 12v battery. Some of our battery to battery chargers are supplied with pre wired leads or can be supplied as kits for simple installs. The chargers are all fully automatic activating via the rise of voltage like a voltage sense relay making them very simple to use but most have the option of ignition controll if required.

Modern Brake Regenerative Braking Battery to Battery Charging Systems

For all of the latest spec vehicles including Mercedes Blue Efficiency Sprinters, VW T5 and T6 Blue motion, Vauxhall Ecoflex and Fords Econetic Transits it is recommended to use a battery to battery charger form range of battery to battery chargers, smart charging alternator kits or Sterling Power products. This is because the alternators on these vehicles will cut alternator power when not needed to save fuel then raise this voltage to very high levels when needed which can damage both relay and leisure battery.

Please see a PDF file to explain more about why you can onle use this type of charging system for your vehicle

Brake Regeneration Information PDF

Please click on the links below for a selection of our battery to battery chargers

Durite Relay
12v 30amp Charger
Medium Duty Kit
12v 60amp Charger
Ignition kit
12V 25amp Charger
Ignition kit
24v to 12v 20amp Charger

Intelligent (VSR) Voltage sense relay and Voltage sense relay Kits

VSR Wiring Diagram

The voltage sensed relays and kits we supply are the simplest to install. There is no need to supply a switch or ignition feed to control the relay as they work on the rise and fall of the voltage from the alternator when the vehicle is running. The relay cuts in to allow power to charge the axillary battery at approx. 13.3 volts and cuts out to isolate the axillary battery at approx. 12.8 volts. All the voltage sense relays and kits are simply installed by connecting the main starter battery to the leisure battery via a suitable fuse as close to each battery to protect the circuit and the relay with no need for any wiring to the vehicles wiring or alternator making it it the best solution for most modern vehicles with standard charging systems. .

We offer a range of the very popular 12v 140amp voltage sense relays which range in cost and operating voltages which may suit your vehicle, budget or intention of use better. All of the relays work in a similar way from the rise voltage from the vehicles charging system when you start start your engine which activates the relay and allows the second or leisure battery to be charged whilst you are driving. When you are stopped and the engine has been switched off the voltage drops and the relay then isolates both batteries. This activation voltage and isolation voltage is different in all of our voltage sensitive relays so please read the information below for advise on which will be best for you. All of the 140amp voltage sensitive relays we supply are duel sensing which means that if you apply a charge to the leisure battery via a mains battery charger or solar panel it will activate the relay if the voltage rises above the relay activation voltage allowing charge to flow through the split charge system in reverse to the main starter battery. This will need to be isolated using a battery isolator between the leisure battery to the relay if not required.

Durite 12v 140amp Relay

Actuation voltage 13.3v and isolation voltage 12.65v +/- 0.1v
The Durite relay is still the most commonly known and popular voltage sensitive relay but please note that Durite lowered the isolation voltage of this relay to 12.65v which means the relay can stay connected for longer periods after the engine has been switched off until either the main starter battery or leisure battery drops below the isolation voltage.

Durite Relay
Durite 12V 140amp Relay
Medium Duty Kit
Durite Relay Kits
Ignition kit
Durite Ready Made Lead Kits

M-Power Relay

Actuation voltage 13.3v and isolation voltage 12.8v
The M-Power relay is a high quality popular relay more well known in the marine world and for a good isolation voltage at 12.8v when the engine is switched off is our recommended product for most installations. As the isolation voltage is higher this means that the relay will disconnect sooner at 12.8v leaving a much higher charge in your main starter battery for when you need to start the vehicle.

M-Power Relay
M-Power 12v 140amp Relay
M-Power Kit
M-Power Relay Kits
M-Power Ready Made Kit
M-Power Ready Made Lead Kits>

HC Cargo 140amp Relay

Actuation voltage 13.3v and isolation voltage 12.8v
The Cargo relay is from our new lower priced range of kits and relays but offers a fully e-approved professional quality relay and split charge system with good isolation voltage at a great price. If you are looking for a good quality split charge system at a great price then we also recommend this product.

Cargo  Relay
HC Cargo 12v 140amp Relay
M-Power Kit
HC Cargo Relay Kits
HC Cargo Ready Made Kit
HC Cargo Ready Made Lead Kits>

Please note that the rest of this page is still under construction

Heavy Duty relay ignition controlled Systems

The ignition or switch controlled split charge kits are a bit more complicated to install but not too difficult. The relay is simply controlled by a 12v feed which can be taken from the alternator warning light wire, any positive ignition feed when the vehicles ignition is on or even just a simple on/off switch but if using the switch method its important to remember to switch it off when you stop to ensure the batteries are isolated so the starter battery isnít drained.

Please see the list of split charge systems we supply plus pdf links to there fitting instructions

Light Duty Split Charge Systems

All of our lower priced Light Duty kits are all supplied with 42amp cable.

This type of kit can be supplied with a heavy duty 100amp ignition switched relay.
"Please click hear for our ignition controlled relay fitting instructions".


Or for a 70amp (VSR) voltage sensitive intelligent relay.
"Please click hear for our voltage sensitive relay fitting instructions".

All our light duty kits can be supplied from 2mtrs to 8mtrs and are a great way to charge up to a 110ah leisure battery on a budget

This type of split charge relay kit are ok for all Day Vans, Camper Vans, Mobile Workshops, Boats and cars using light domestic 12volt auxiliary power for, Lighting, Fridges, and most general camping and leisure products.

Medium Duty Professional Split Charge Systems

All of our Medium duty Split charge kits are all top quality professional kits supplied with 70amp(10mm2)cable. These kits can be supplied with either a heavy duty 100amp switched relay or 140amp (VSR) voltage sense intelligent relay and can be supplied from 2mtrs to 10mtrs. We also offer this range of kits with ready made leads for simpler installations saving you time and money. This type of kit is great for charging 85amp to 110amp leisure battery(s) and like our (leisure) kits are great in all Day Vans, Camper Vans, Mobile Workshops, Boats and Cars. This type of kit can allow you to charge your leisure battery(s) at a much higher rate safely, so can be used on all systems using low power amps and inverters

Heavy Duty Professional Split Charge Systems

All of our professional are the same as our heavy duty Split charge kits but are all supplied with 110amp(16mm2)cable. These kits can also be supplied with either a heavy duty 100amp switched relay or 140amp (VSR) voltage sense intelligent relay and can also be supplied from 2mtrs to 8mtrs. We also offer this kit with ready made leads for very simple installations on the (VSR) system. This type of kit is great for charging 85amp to 220amp leisure battery(s) and like our (leisure & Heavy Duty) kits are great in all Day Vans, Camper Vans, Mobile Workshops, Boats and Cars. This type of kit can allow you to charge your leisure battery(s) at a much higher rate safely, so can be used on all systems using higher drain electrical items, like amps, inverters, winches and high power motors in professional vehicles.

Industrial Split Charge Systems

We also offer a Very Heavy Duty Kit Supplied with 110amp (16mm2) or 170amp (25mm2) Cable. These kits are all supplied with a very heavy duty 180amp (VSR) voltage sense relay and can be supplied from 2 mtrs to 8 mtrs. This type of kit is suitable for charging systems with multiple banks of batteries or to use with very high power winches and motors so are great to use in all mobile workshops, industrial vehicles and 4x4s.

All of the above Split charge kits or parts we supply are all top quality, UK supplied and fully tested E approved parts.

Simply Split Charge are a small family run business offering one of the largest range of split charge kits and systems we think you will find anywhere. We know and understand that one kit does not fit all. If you cant find the type of kit or system you need or require any help or advise on which kit will be best for you then please contact us at

info.simplysplitcharge@gmail.com

For a human then please call our sales office
Monday to Friday 9am to 4pm or Saturday 9am to 1pm ... Sunday Closed

01235 203698
07818 603245

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Simply Split Charge Ltd
72 Kynaston Road
Didcot
OX11 8HA

Company number, 9239495
VAT Number, GB: 205321165

Contact Information

01235 203698
07818 603245
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Office hours
Monday to Friday 9am to 4pm
Saturday 9am to 1pm

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