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Unread 09-07-2009, 17:38
EricVanWyk EricVanWyk is offline
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Re: Solar Battery Plant Question

Our battery expert had the following to add:

Quote:
You can put Pb-acid batteries in parallel. You can do this with other chemistries that are charged in the same way (current limit to voltage limit to taper current cutoff), such as Li-ion and Ni-Zn. All you need to do is charge them fully before connecting. Ni-Cd and Ni-MH are very difficult.



Two important issues with putting cells and/or batteries in parallel are:

Safety. If one cell or battery is shorted internally, the energy from the other flows to the shorted one, thus increasing fire safety hazard significantly. Thermal fuses may be required.
Balance. If the parallel group is exposed to frequent thermal cycles or large temperature gradients, such as under the hood of a car, then charge will be transferred between the components in parallel. Under favorable conditions, such as indoors, this is not significant. A symmetrical layout can help reduce thermal gradients caused by self-heating.