This looks good from ScrewFix...

http://www.screwfix.com/app/sfd/sea/searchresults.jsp;jsessionid=HXPJLYGDKJOO3CJO2C3CIIQ?_dyncharset=UTF-8&q=&n=43494&pn=1&pd=1&pi=1&cn=1&cd=1&x=14&y=11

At 120Watts it would run my C/H pump for a few hours from a reasonable
size car 12V battery.

If you do a search of their site for "invertor" you get the same item
that costs £79.19 instead of £19.79. I hope the latter is correct.

Chris.

> At 120Watts it would run my C/H pump for a few hours from a reasonable
> size car 12V battery.
>
> If you do a search of their site for "invertor" you get the same item
> that costs 79.19 instead of 19.79. I hope the latter is correct.


I got a 300W (600W peak surge) one from Maplin for similar money.

Christian.

On 13 Sep 2005 08:32:19 -0700, mcbrien410@aol.com wrote:

| This looks good from ScrewFix...
| 
| http://www.screwfix.com/app/sfd/sea/searchresults.jsp;jsessionid=HXPJLYGDKJOO3CJO2C3CIIQ?_dyncharset=UTF-8&q=&n=43494&pn=1&pd=1&pi=1&cn=1&cd=1&x=14&y=11
| 
| At 120Watts it would run my C/H pump for a few hours from a reasonable
| size car 12V battery.

120 watts is 10 amps at 12 volts, so it will run for 5 hours from a new
50AH battery.  11 hrs from a 110 AH leisure battery.

For myself, I do not miss the central heating during the first hour or two
of a power cut. we have not have had any that long for 25 years.   The
walls are warm and radiate/convect heat back into the house.

-- 
Dave Fawthrop <dave hyphenologist co uk> 
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.

mcbrien410@aol.com wrote:

> This looks good from ScrewFix...
>
> http://www.screwfix.com/app/sfd/sea/searchresults.jsp;jsessionid=HXPJLYGDKJOO3CJO2C3CIIQ?_dyncharset=UTF-8&q=&n=43494&pn=1&pd=1&pi=1&cn=1&cd=1&x=14&y=11
>
> At 120Watts it would run my C/H pump for a few hours from a reasonable
> size car 12V battery.


According to another recent thread it will also knacker the battery.
You need one designed to be discharged called a "leisure battery".

MBQ

Someone said.....

> According to another recent thread it will also knacker the battery.
> You need one designed to be discharged called a "leisure battery".
>
> MBQ


Apparently car type lead acid batteries are rated at a 20 Amp rate.
That means that they will output their rated capacity, say 60 Ampere
Hours, for 3 hours at 20 Amps or 6 hours at 10 Amps. Anything above the
20 Amps will not give the same 60 Ampere Hour capacity.

Has anyone any actual hands on with this ScrewFix invertor??

Chris.

mcbrien410@aol.com wrote:

> Someone said.....
>> According to another recent thread it will also knacker the battery.
>> You need one designed to be discharged called a "leisure battery".
>>
>> MBQ
> 
> Apparently car type lead acid batteries are rated at a 20 Amp rate.
> That means that they will output their rated capacity, say 60 Ampere
> Hours, for 3 hours at 20 Amps or 6 hours at 10 Amps. Anything above the
> 20 Amps will not give the same 60 Ampere Hour capacity.
> 
> Has anyone any actual hands on with this ScrewFix invertor??


20 hour rate, not amp.
So 60 amp hour will output 3 amps for 20 hours.
But not quite 6 amps for 10 hours.
(you don't want to discharge car batteries below about 40% often - it
kills them)