I agree. there is no need for down converting. Todays wisdom when it comes to wind generators is to not regulate the voltage but rather regulate the charge. What this means is whatever the voltage is it is feed into the bank. When the battery is topped the power goes to a a resistive load.
An open 12v rated panel may have a voltage of 36v that will drop when hooked up to your battery and will drop based on the load to just high enough voltage to charge at the rated output of the panel based on ohms law. The charge system used with a solar panel works on the same principal as described above, but on a much smaller scale, as there is a limit to the voltage produced by the panel vs. a blow while charging with a wind generator may produce voltages in the triple digit.
Kevin
http://simplyrv.
For RV information
--- On Thu, 7/16/09, Chris Witzgall <chris@witzgall.
From: Chris Witzgall <chris@witzgall.
Subject: Re: [Electric Boats] solar panel selection
To: electricboats@
Date: Thursday, July 16, 2009, 6:43 PM
No need to ³downconvert². Some MPPT controllers do this for you, such as the
BZ500. There are others as well.
Chris
On 7/16/09 9:05 PM, "Mike" <biankablog@
>
>
>
>
> Roger:
>
> When I installed my Thoosa 9000. I already had two Siemens 75 watt panels for
> the 12 volt house system. I bought two more Siemens (now Shell) 75 watt panels
> and came up with a switching system so that I could configure the panels to
> either charge the 48 volt motor bank or the 12 volt house bank. Then I found a
> 60 watt 48 volt Kanaka panel for about $250 (I bought two) which simplified
> things immensely when charging the motor bank. I installed one Kanaka 48 volt
> panel on the boat last year along with two 75 watters for the 12 volt house
> bank. This year to get in the boat in the water faster I only installed the
> one 48 volt and one 12 volt 75 watt panel while I came up with a mounting
> scheme for the other two panels. But, I found that my needs are being met by
> the two panels alone. Sometimes less is more. You might try a 48 volt panel
> and downconvert it via a dc to dc converter to charge your 36 volt bank.
>
> Mike
> http://biankablog. blogspot. com
>
> --- On Thu, 7/16/09, roger.dann <dann.roger@
> <mailto:dann. roger%40gmail. com> > wrote:
>
> From: roger.dann <dann.roger@
> Subject: [Electric Boats] solar panel selection
> To: electricboats@ yahoogroups. com <mailto:electricboa ts%40yahoogroups .com>
> Date: Thursday, July 16, 2009, 1:53 PM
>
>
>
> What is the latest technology for solar panels suitable for marine electric
> drives. This area seems to be changing quickly and the types and costs are all
> over the place. Anyone with experience on this and can offer some advice? I
> have a 36v system and really want to keep the installation light.
> Roger
>
> [Non-text portions of this message have been removed]
>
>
>
>
>>
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