Good deal on these connectors

EVassemble sells these 50A connectors for $1.50. That is a really good deal. They say they are 50A connectors but the metal on the inside is the exact same piece thats in a 75A Powerpole connector so Im sure they will work on a little higher amperage.
http://www.evassemble.com/index.php?main_page=product_info&cPath=9&products_id=134

Those are the Anderson SB50 Multipole connectors, or clones of them, and I've used those with great success on CrazyBike2's SLA setup, with used connector parts from powerchair and UPS systems. I just used the existing wire already crimped into the contacts, and move the contacts from shell to shell to create the wire lengths and/or harnesses I need (since some of the wires have contacts on both ends, from the UPS stuff).

I've run upwards of 100-130A thru them for a few seconds at a time without a problem, albeit unintentionally (thru chain derailing/failures causing lockup of the powerchair motor system). :lol:

They are far more sturdy than the little 15A-45A Powerpoles most people use, mostly due to the shell design and contact thickness/stiffness. One downside to them is that you can't rearrange them into easily-lockable/keyed blocks together, so you more or less need to use different shell types for stuff that isn't supposed to plug into each other to prevent KFF/etc. They make them in a number of colors, each of which is keyed differently, so you can't plug one into another (without intentional disfiguring of the keyways).

IIRC, there are different levels of contacts you cna get for them, too, just like the Powerpoles, with different spring/retention forces and different current ratings. At a certain point you have to go up to the next size shell and contact, though, some of which are the size of my hand.

I have a lot of POWERPOLE connectors the shell on the 50amp and the shell on 75amp will hold the same connectors but the metal connector for the 75 amp is made for larger wire than the metal tabs for the 50amp so thar are not the same.

Actually, they do make the same contacts for both PP75 and SB50, in a few flavors. Go here:
http://www.andersonpower.com/products/multipole-sb.html
then click the "Drawings (+)" link underneath the "SB50 (50 amp)" subheading. There's a listing then of all the subparts available, including these:

• 1307 Loose Piece Low Detent Contact for PP75 & SB50
  5900 (Flared) Loose Piece High Detent Contact for PP75 & SB50
  5952 (Flared) Loose Piece High Detent Contact for PP75 & SB50
  5915 Loose Piece High Detent Contact for PP75 & SB50
  265G1-2,G5-6 High Detent Reel Contact for PP75/SB50
  265G3-4,G7-8 Low Detent Reel Contact for PP75/SB50
  5914 Loose Piece High Detent Contact for PP75/SB50
  5953 Loose Piece Low Detent Contact for PP75/SB50
  Loose Piece Low Detent Contact #10/12 Wire for PP75/SB50
  Flared Loose Piece Low Detent Contact #6 Wire for PP75/SB50
  75BBS PP75/SB50 Busbar Contact
  75BBS PP75/SB50 Bus Contact

Oh, and for a complete list of all the compatible contacts for the SB50, its at the bottom of the first page of this document:
http://www.andersonpower.com/files.php?file=DS-SB50(3).pdf
The list of contacts for the PP75 is in this one:
http://www.andersonpower.com/files.php?file=DS-PP75(6).pdf

Something I noticed before but never thought of the implications of is that they also offer a "CR" or chemical-resistant version of the housings, which is also rated for higher temperatures.

• Operating Temperature Range **
  • SB Line - Polycarbonate (°C) -20° to 105°
  (°F) -4° to 221°
  • CR-SB Line - PBT / PC Blend (°C) -40° to 120°
  (°F) -40° to 248

It's not much of a difference, but hey, it might prevent a *few* of the failures caused by shell deformation.

AFAIK they don't offer such a thing in the PPxx type housings.

• Operating Temperature (°C)*** -20° to 105°
  (°F) -4° to 221°