In your case, yes the battery cables should also be 4/0. They are carrying the same load as the inverter cables. Max amp rating on 2/0 is around 190 amps, and that inverter can surge to well over 250, even though at 4kw it would pull around 180.
And a nitpick - those are not cells, they are batteries. Each battery has 6 cells. .................................................................................................. Northern Arizona Wind & Sun - Electricity From The Sun Since 1979 Solar Discussion Forum: http://www.wind-sun.com/ForumVB/ .................................................................................................. ----- Original Message ----- From: Mick Abraham To: RE-wrenches Sent: Friday, February 19, 2010 12:01 PM Subject: [RE-wrenches] single string of batts: must the interconnects beinverter size cables? Example: 12 two volt battery cells in one 24 volt string. 4kW inverter/charger has 250 amp DC breaker size and 4/0 cables...as the inverter folks would want. So...do the "cell to cell" interconnect cables have to also be 4/0? In the example above, 2/0 interconnects would suffice from the standpoint of basic safety...and even from the voltage drop standpoint...right? Inverter company people may be best qualified to answer this, but any replies will be appreciated. While I'm at it: do the inverter folks request oversize cables because they want more capacitance on the DC input...or what? Jolliness, Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 ------------------------------------------------------------------------------ _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
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