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Old 05-02-2015, 06:18 PM   #15
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The difference is that they CAN be run down to 20% state of charge.

Redo the math with 20% instead of 50%.

Your batteries have 210 Ah usable.

This one has 466 AH usable.

Now you need to double your batteries. More space and weight.

They also claim 3000 or more cycles, instead of 700 to 1200, that AGM claim.
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Old 05-02-2015, 07:10 PM   #16
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The current configuration of Tesla's Powerwall battery wouldn't work in an RV. The Powerwall is designed to mount on a wall - it's 4' tall and almost 3' wide. Chris Dunphy reports the internal voltage of the battery runs between 350V and 450V. Supposedly it converts to 48V to work with a residential solar inverter. Not likely to operate at 12V or even 24V.
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Old 05-02-2015, 07:17 PM   #17
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Tesla unveils 7kw battery pack for $3,000

Quote:
Originally Posted by Koop View Post
The current configuration of Tesla's Powerwall battery wouldn't work in an RV. The Powerwall is designed to mount on a wall - it's 4' tall and almost 3' wide. Chris Dunphy reports the internal voltage of the battery runs between 350V and 450V. Supposedly it converts to 48V to work with a residential solar inverter. Not likely to operate at 12V or even 24V.

Voltage divider networks are not new science. But 1250FP of torque and 425HP takes lotsa space. There goes the 1/2 bath and the hot tub.
OTOH, a Tesla costs more than my MH. Yikes!
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Old 05-03-2015, 08:44 AM   #18
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[QUOTE][/The difference is that they CAN be run down to 20% state of charge.

Redo the math with 20% instead of 50%.

Your batteries have 210 Ah usable.

This one has 466 AH usable.QUOTE]

Actually, AGMs can readily tolerate discharge down to 35-40%. I'll grant that lithium-ion batteries are even better, but that comes at a price.
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