cabling
- Thread starter cjtots72
- Start date
cjtots72 said:
Two good quality jumper cables or equivalent is a good start, or some welding cable would be just as good.
A 110Ah battery is capable of donating well over 1000A into a load (or spanner!) for a short time, so it warrants using good thick cable.
This is of course without knowing you want to parallel two batteries?
If you have a standard battery locker it takes only one battery so where is the second one going as this could affect the answer.
Batteries are very heavy and a second 110 amp battery at the front could cause a problem with nose weight if it is at the front so you need to look at its location and make sure you stay within the MTPLM.
Batteries are very heavy and a second 110 amp battery at the front could cause a problem with nose weight if it is at the front so you need to look at its location and make sure you stay within the MTPLM.
Absollutely nothing wrong with connecting two batteries together to either increase the Ah capacity ( in parallel) or double the voltage (in series),it happens in industry all the time.
Ideally the batteries should be same rated voltage and Ah capacity.
The cables should be rated to carry the current you expect to use.
Batteries in parallel will produce more fault current,cables will have a short time high current rating and should also be rated to carry this current for a short period of time until the protective device removes the fault.If there is no protective device cables will heat up,overheat and possibly go on fire.So it's important to install a correctly rated fuse or circuit breaker.
If using a circuit breaker it must have the breaking capacity to interrupt the fault current.
Ideally the batteries should be same rated voltage and Ah capacity.
The cables should be rated to carry the current you expect to use.
Batteries in parallel will produce more fault current,cables will have a short time high current rating and should also be rated to carry this current for a short period of time until the protective device removes the fault.If there is no protective device cables will heat up,overheat and possibly go on fire.So it's important to install a correctly rated fuse or circuit breaker.
If using a circuit breaker it must have the breaking capacity to interrupt the fault current.
bertieboy1 said:
there is no need to use a circuit breaker just have the wires heavy enough to carry the load.
note, there is no such requirement on jump leads [exactly what you are doing] mobility scooters or lorries [converting 2 12v batteries to 24v]
Colin makes a very good point about jump leads. But even jump leads can heat up when the flat battery is connected to a fully charged battery. How much they heat up depends on the length, and resistance of the jump leads, and the current that flows when they are connected. Certainly with cheaper jump sets, its often the spring clips that suffer the most because they cant make enough contact area with the battery terminals.
So if a parallel connection is to be made, ensure you have good quality terminal connectors that have a large contact area. Use a cable with a large cross-sectional area, - an old jump set could be a good donor for the cable.
There are several different types of battery for example Leisure, Traction, Starter and whilst they may look similar on the outside, they will have a different internal construction to suit the usage they are designed for.
All types of battery will wear out, and its condition will affect its ability to accept charge and to deliver current. If you mix types or conditions of battery in a parallel configuration, you can get some substantial currents flowing between the two batteries. It this situation that you should avoid.
To avoid problems of transfer currents ideally always use two new batteries of the same make, type and size as this ensures both batteries will be in the same condition. Problems can arise if the two batteries are not in the same condition, type or size.
But in conclusion, I like others have to ask why the OP needs so much more battery capacity with the issues its brings of weight and stowage etc.
So if a parallel connection is to be made, ensure you have good quality terminal connectors that have a large contact area. Use a cable with a large cross-sectional area, - an old jump set could be a good donor for the cable.
There are several different types of battery for example Leisure, Traction, Starter and whilst they may look similar on the outside, they will have a different internal construction to suit the usage they are designed for.
All types of battery will wear out, and its condition will affect its ability to accept charge and to deliver current. If you mix types or conditions of battery in a parallel configuration, you can get some substantial currents flowing between the two batteries. It this situation that you should avoid.
To avoid problems of transfer currents ideally always use two new batteries of the same make, type and size as this ensures both batteries will be in the same condition. Problems can arise if the two batteries are not in the same condition, type or size.
But in conclusion, I like others have to ask why the OP needs so much more battery capacity with the issues its brings of weight and stowage etc.
The circuit breaker is not for the jump leads but for the load.If batteries are paralleled and if a fault develops in the load the battery(s) will supply a very high current into the fault,in which case the circuit breaker or fuse must have the ability to disconnect the fault from the battery safely.ie sufficient breaking capacity.
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