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Re: (ET) 48v electrac

I am not as concerned about the relays and controller components with a 48V 
pack as i am about the motors on the various ET attachments;

A solid state DC to DC converter should be able to handle all 36V control 
components off the 48V pack.  The accessories would have to run off the full 
pack however, or with a power tap on 6 of 8 batteries (Which would be a bad 
idea due to the severe imbalance it would create).

Which accessories can run on 48V without a problem?  The blower, tiller, and 
the front mounted sweeper I presume?  How about the mower motors, front 
loader, forklifts leaf sweeper, or other accessories with a smaller PM 
motor?

Has anyone tried to attach a ET implement to the Electric Ox?  If so, which 
ones?  If not, why not?

Matt


From: 
"subscriptions aeolusdevelopment com"<subscriptions aeolusdevelopment com>

Reply-To: subscriptions aeolusdevelopment com
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) 48v electrac
Date: Fri, 3 Nov 2006 09:40:20 -0500

Matthew callahan Wrote
>Not necessarily, you could get trojan T-890's or something like those.
They
>are 8 volt batteries with four cells instead of three, but the same size
as
>a T-105 6V battery.  So you wouldnt have to pack a extra two batteries,
and
>have more HP, but range should be about the same in terms of lead weight.
>
>The Electric Ox is a 48V tractor, and i assume they use the 8V batteries.
>Some golf carts are now using the T-890's at 48 volts instead of 36, but
>retain the same battery tray design and set-up.

The OX does use 8V batteries.

David's power objections though are valid.  You'll be dropping 1.8x the
power loss in the relay coils.  That may not take much off of the battery
life but it'll kill the relays.

Other components will also show problems, it's possible some will just fail
immediately.

Robert

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