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Old 08-01-2013, 11:46 AM   #15
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Location: N. Central AZ
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Originally Posted by Gorlininc View Post
I wouldn't turn on the hair dryer anymore when your not plugged it to shore power or the generator on. That's a draw of over 100 amps on the batteries. I'm surprised they lasted 30 seconds.
When I was running four Trojan T-105s, I could run the microwave/convection oven for thirty minutes on a full charge with no problem. It operates on 1,400 watts, (not constant, but close) well over 130 AMPs, and the voltage would stay at 12V or more.

My six Costco's will drop to below 11.5 after a couple of minutes. Its as if they have a high internal resistance. I can still run lower powered appliances, like a food dehydrator all day, with solar panels, but still seems like it is a big draw on the batteries. Connections and cables are not my problem!

We are heading out for six weeks mid month and will equalize before leaving. Hoping they will be OK. If I need to change, I will return to four T-105s. Two would probably be enough since my electrical need have changed considerably. LEDs and Ipads sure use a lot less AHs! Cold weather/winter, with limited sun on the panels, needs a little bit more for the furnace fan, so four may be needed.

'01 National RV Tropi-Cal, Ford V10, '01 Suzuki GV 4X4 Blue Ox Tow Bar,300 Watts Solar, 2500 Watt '458' Inverter, NO TVs, Most light fixtures upgraded to LEDs

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Old 08-01-2013, 12:09 PM   #16
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Location: Phx, Arid~zona
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Last week, I went to take Sadie to the vet. Truck wouldn't start. No click-nothing. Cleaned battery terminals and it started fine. Checked with hydrometer-1250. Right at the line between good and fair. Not the best, but there should be some life left. Two days later, went to start it-nothing. No click again. Checked terminals again-NG. Took it to Autozone and it didn't read a thing. Bought a red top Optima. I have almost weekly Dr appts and don't need a panic attack minutes before an appt.

I got three years out of it and it pro-rated at $46.66. Optima has 3 year free replacement.

BTW, I got Sadie in that first afternoon.

2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
If Dunner (RVM23) can't fix it, it ain't broke!
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Old 08-03-2013, 03:50 PM   #17
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Things are looking better!

OP here.

I retested the batteries with multimeter and with hydrometer. All tested good.

I then took a reading between the chassis ground connection and the positive terminal of the battery. The result was 0.3 dcv lower.....

So, I disconnected the negative terminal connections and cleaned them up very aggressively. After reconnecting I switched on the inverter and was able to:

Run the hair dryer for 3 minutes on high heat before turning it off myself.

Run the microwave on high for 1 minute to heat a cup of water.

Once the load tests were done, I switched off the inverter and the meter jumped back to 12.5 volts.

It looks like I can put off the battery purchase, but do need to once again clean all the battery terminals.......and clean the ground connection to the chassis in that battery compartment.

Thanks to all who responded with helpful ideas.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 08-03-2013, 05:05 PM   #18
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Thx for the follow-up, Dean.
2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
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Old 08-03-2013, 08:24 PM   #19
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Thank you for the update, they are very important.
John & Cathy R.
06 Pace Arrow 38L W24
08 Lincoln MKX AWD
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Old 08-03-2013, 11:18 PM   #20
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Get some electrical grease and grease up every connection on the battery and battery to ground connections, reduces the need to clean due to less oxidation

Tony & Lori
1989 Country Coach Savannah SE
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battery, purchase

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