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Post by lstyles on May 26, 2019 19:28:45 GMT
Could I parallel these two batteries if both are new and seem to have the same charging characteristics? I know standard thought is that you should t so this with AGM or other batteries but was wondering about lithium’s from same company with same charging specifics. Thanks!
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Post by jeep2liberty on May 27, 2019 12:30:29 GMT
I assume they are both lifepo4 lithium batteries. Even if they are not both new, you are good to go. Just dont forget the fuse/circuit breaker at EACH battery for proper protection.
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Post by lstyles on May 27, 2019 18:19:50 GMT
Well that is great news! I currently have one 170 ah Lithium battery and was thinking I might need to add another (would prefer to get a 100ah rather than a 170ah as I don’t need THAT much extra capacity). I have a 300amp fuse from battery to positive bus so I am not sure I completely understand what you are saying about a separate fuse for each battery. Would I put a fuse on each positive wire before joining them together in parallel? Thanks!
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Post by bupkis on May 27, 2019 18:26:33 GMT
one fuse at batt1 + terminal is fine, connect them in a 'balanced' fashion, the charge and load come off the same terminals. clicky ^^^
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Post by tattoo on May 27, 2019 21:27:15 GMT
Well that is great news! I currently have one 170 ah Lithium battery and was thinking I might need to add another (would prefer to get a 100ah rather than a 170ah as I don’t need THAT much extra capacity).
You need all the extra capacity you can get believe me.....
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Post by lstyles on May 31, 2019 14:58:22 GMT
Well that is great news! I currently have one 170 ah Lithium battery and was thinking I might need to add another (would prefer to get a 100ah rather than a 170ah as I don’t need THAT much extra capacity).
You need all the extra capacity you can get believe me.....
I currently have 300amp fuse and disconnect switch coming off pos terminal and going to the positive bus bar. If I add in the 100ah battery would I need to increase that? I have a Victron 12/2000 watt inv/charger running connected to the pos bus (with another 300 amp fuse and disconnect) in line which is what Victron suggests (2/0 cable).
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Post by bupkis on May 31, 2019 17:05:54 GMT
No, fuse is there to blow so your wires don't melt and catch fire. Adding batteries does not change the current in the existing wires, it does reduce the current through each battery cuz the pair shares the current.
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Post by lstyles on Jun 1, 2019 15:00:17 GMT
My understanding was that when you combine two batteries in parallel then their current is additive. Each of these batteries has a100amp max d/c current so that when I combine them I will now have a 200 amp max d/c current which will allow me to run my 209w inv/charger at max output. With 300 amp fuse and 2/0 wiring it looks like I will still be good to go! Thanks
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