CORRIGENDUM No. 2 - Yap State Government

controller, meaning that each unit does not have the capacity to control battery charge as well as load
output. As the SCS system has an inverter, there is no need for the charge controller to also control the
load. Thus requesting a charge controller “for a load of 70A (in 48V – 3360W)” isn’t really relevant.
According to our design, a 60A charge controller is more than sufficient to manage the current from the
PV array which is the primary concern when choosing such components. Please specify whether this will
be acceptable.
Response:
No, the specs need to comply with the technical tender document. We have left a window open to send
besides the offer that follows the set specification to propose and alternative design.
(k). Clarification Request #11:
Will 24V nominal panels with 72 cells be considered Typically panels that are larger than 130W are 24V
with 72 cells, and the requirements have allowed panels up to 185W.
Response:
No, the specs need to comply with the technical tender document. We have left a window open to send
besides the offer that follows the set specification to propose and alternative design.
(l). Clarification Request #12:
For the SHS will 12V designs be considered If there are 12V DC loads to be used with the system, such as
lights, then a system voltage of 12V would be beneficial and eliminate the need of a DC to DC converter
within the system. It also opens up the range of inverters, as 24V 300W inverters are more difficult to find
that 12V 300W inverters.
Response:
No, the specs need to comply with the technical tender document. We have left a window open to send
besides the offer that follows the set specification to propose and alternative design.
It is however possible that YSPSC might go for the 12V option therefore the charge controllers need to be
able to work with 12V and with 24V.
(m). Clarification Request #13:
Regarding the panel warranty and the following excerpt from Annex II;
The PV modules shall be warranted for at least 20 years and must not experience more than 15% of rated
capacity reduction in output over their lifetime. They also shall be warranted for physical defect for a
period of 10 years.
Typically modules are supplied with 5 year physical defect warranty and 20 or 25 year warranty for a
reduction in power output no greater than 20%. Please specify whether this standard warranty will be
accepted If not please recommend a supplier offering a warranty for rated capacity reduction in output
of only 15%.
Response:
The specifications are the basis of warranty guidelines that are to be met. However alternative warrantees
shall be noted and will be considered but perhaps lead to a lower rating in the evaluation process if higher
warrantees are offered by other tenderers.
As per contract guidelines recommendations of specific suppliers meeting this warranty are not allowed.
(n). Clarification Request #14:
For the SHS both 10mm2 and 6mm2 cables have been specified, please state whether these are required
to be double or single core cables
Response:
The SHS 10mm2 and 6mm2 cables are to be provided as per the specifications of “Annex II g.) wires,
connectors and fuses” and “Annex III 1.8 Wires, connectors and fuses – Ref to g.)” and shall be standard
and flexible insulated single core copper cables.